I have a 1998 GTX the throtle is sticking open inside the carb. I have spayed it and let it soak with everything from WD40, PB blaster to CRC. It seemed to help at first but is back to sticking. I can manually close it at the carb. Is it a tough job to remove the carb? Any other ideas. I disconnected the thumb lever, thats not what is sticking. Thanks